メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4812500 30.4458334, 130.4875000 30.4458334, 130.4875000 30.4500000, 130.4812500 30.4500000, 130.4812500 30.4458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral